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Pressure Converter

Convert pressures between absolute and gauge representations across SI and imperial units.

Formula shown0 inputs definedUpdated Nov 2025By CalcuTotal TeamFree, no sign-up

Quick Summary

Use this when you need:
  • Translate HVAC and compressor specs between psi, bar, and kPa
  • Convert lab vacuum readings between torr, mmHg, and atm
  • Normalize hydraulic calculations that mix gauge (psig) and absolute (psia) pressures
You’ll get:Pressure

Calculator Tool

How this is calculated

Formula:

pressure_target = pressure_source * (source_to_pa / target_to_pa)

In plain language:

Pascals act as the base. Gauge units such as psig add one atmosphere (14.6959 psi) before conversion; psia is treated as absolute psi.

The formula is always visible so you can verify the math and explain your numbers to anyone who asks.

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What these terms mean

Pressure

Pressure used in the calculation.

When to use this calculator

  • Translate HVAC and compressor specs between psi, bar, and kPa
  • Convert lab vacuum readings between torr, mmHg, and atm
  • Normalize hydraulic calculations that mix gauge (psig) and absolute (psia) pressures
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